Nanodiamond Coating Reduces Reflection Loss in Solar Cells
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Solution Overview
Problem
Conventional photovoltaic solar cells have limited efficiency due to reflection of incident radiation and sub-optimal angle of incidence, with existing methods failing to significantly improve these inefficiencies.
Innovation Solution
A nanodiamond coating, comprising nanodiamond particles suspended in a liquid medium with a fluoropolymer, is applied to the surface of solar cells or glass sheets in photovoltaic modules to reduce reflection and enhance the angle of incidence, thereby increasing the conversion efficiency of solar radiation to electricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional anti-reflection coatings (silicon nitride or titanium oxide) are applied to reduce surface reflection, then reflection is reduced, but the conversion efficiency improvement is limited and quantum efficiency limitations remain
Solution Approach 1:
The patent changes the physical and chemical parameters of the coating material by using nanodiamond particles (1-100 nm size range) with specific surface treatments and compositions, rather than conventional bulk materials. This nanoscale parameter change enables superior optical properties including reduced reflection and improved light coupling that conventional coatings cannot achieve
Solution Approach 2:
The patent creates a composite coating system combining nanodiamond particles with binding agents or polymers to form a multi-component anti-reflection coating. This composite structure leverages the unique properties of nanodiamonds (high refractive index, chemical stability) combined with the adhesive and structural properties of the binding matrix, achieving performance superior to single-material coatings
2Loss of energy
If texturization is applied to reduce reflection, then reflection is reduced, but the angle of incidence improvement is sub-optimal and efficiency gains are limited
Solution Approach 1:
The patent applies nanodiamond coatings with spatially varying properties, including gradients in particle size, concentration, or composition across the coating thickness or surface area. This local quality variation enables optimized light coupling for different angles of incidence, with the coating structure tailored to handle both normal and oblique incident light effectively
3Use of energy by moving object
If conventional coatings are used to improve light coupling, then light coupling is improved, but heat dissipation remains insufficient and performance degrades at varying temperatures
Solution Approach 1:
The patent introduces nanodiamond particles as an intermediary thermal management component within the coating structure. These particles serve as thermal conduits that conduct heat away from the photovoltaic interface while simultaneously maintaining optimal optical properties, thus mediating between light coupling requirements and thermal management needs
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The nanodiamond coating achieves efficiency improvements of up to 11.5% by refracting sunlight to normal or near-normal incidence, dispersing photons that would otherwise hit at grazing angles, and improving heat dissipation, reducing the need for expensive tracking systems and enhancing performance across varying temperatures.
Implementation Method 1
The nanodiamond coating achieves efficiency improvements of up to 11.5% by refracting sunlight to normal or near-normal incidence
Implementation Method 2
dispersing photons that would otherwise hit at grazing angles
Implementation Method 3
improving heat dissipation
Data Source
AI summary
A nanodiamond coating for use on a solar cell, the coating including a nanodiamond material suspended in a liquid, wherein the nanodiamond material has a size range from about 1 nm to about 10 nm. Methods for improving the efficiency of a solar cell are provided, including, mixing a nanodiamond material with a liquid polymer or non-polymer solvent to form a nanodiamond-polymer suspension, forming a coating of the suspension on a top surface of a solar cell, and drying the coating such that a dried nanodiamond-polymer layer remains bonded to the solar cell. Useful nanodiamond coating compositions may include a nanodiamond material, a fluoropolymer, a liquid solvent for the fluoro-polymer and at least one additive selected from the group consisting of dispersing agents, adhesion promoters, and coupling agents. The fluoropolymer may also be used in the form of an aqueous dispersion.